SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'vi' 
  AND lang.name IN (
    'email', 'returning_customer', 'phone', 
    'password', 'error_incorrect_login', 
    'register_new_account', 'forgot_password_question', 
    'continue', 'register_new_account', 
    'forgot_password_question', 'login_redirect_text', 
    'email', 'returning_customer', 'phone', 
    'password', 'error_incorrect_login', 
    'register_new_account', 'forgot_password_question', 
    'continue', 'register_new_account', 
    'forgot_password_question', 'login_redirect_text'
  )

Query time 0.00041

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": 9,
      "filtered": 100,
      "attached_condition": "lang.lang_code = 'vi' and lang.`name` in ('email','returning_customer','phone','password','error_incorrect_login','register_new_account','forgot_password_question','continue','register_new_account','forgot_password_question','login_redirect_text','email','returning_customer','phone','password','error_incorrect_login','register_new_account','forgot_password_question','continue','register_new_account','forgot_password_question','login_redirect_text')"
    }
  }
}