SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'vi' 
  AND lang.name IN (
    'text_out_of_stock', 'sku', 'shipping', 
    'view_product', 'select_options', 
    'add_to_cart', 'notify_when_back_in_stock', 
    'enter_email', 'enter_email', 'go', 
    'enter_your_price', 'contact_us_for_price', 
    'sign_in_to_view_price', 'inc_tax', 
    'including_tax', 'save_discount', 
    'availability', 'items', 'on_backorder', 
    'in_stock', 'availability', 'on_backorder', 
    'availability', 'text_cart_min_qty', 
    'text_edp_product', 'text_out_of_stock', 
    'sku', 'shipping', 'view_product', 
    'select_options', 'add_to_cart', 
    'notify_when_back_in_stock', 'enter_email', 
    'enter_email', 'go', 'enter_your_price', 
    'contact_us_for_price', 'sign_in_to_view_price', 
    'inc_tax', 'including_tax', 'save_discount', 
    'availability', 'items', 'on_backorder', 
    'in_stock', 'availability', 'on_backorder', 
    'availability', 'text_cart_min_qty', 
    'text_edp_product'
  )

Query time 0.00065

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "lang",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "392",
      "used_key_parts": ["lang_code", "name"],
      "rows": 21,
      "filtered": 100,
      "attached_condition": "lang.lang_code = 'vi' and lang.`name` in ('text_out_of_stock','sku','shipping','view_product','select_options','add_to_cart','notify_when_back_in_stock','enter_email','enter_email','go','enter_your_price','contact_us_for_price','sign_in_to_view_price','inc_tax','including_tax','save_discount','availability','items','on_backorder','in_stock','availability','on_backorder','availability','text_cart_min_qty','text_edp_product','text_out_of_stock','sku','shipping','view_product','select_options','add_to_cart','notify_when_back_in_stock','enter_email','enter_email','go','enter_your_price','contact_us_for_price','sign_in_to_view_price','inc_tax','including_tax','save_discount','availability','items','on_backorder','in_stock','availability','on_backorder','availability','text_cart_min_qty','text_edp_product')"
    }
  }
}