SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'de' 
  AND lang.name IN (
    'returning_customer', 'enter_your_phone_no', 
    'enter_your_mail_id', 'password', 
    'forgot_password_question', 'login_with_otp', 
    'register_new_account', 'remember_me', 
    'returning_customer', 'enter_your_phone_no', 
    'enter_your_mail_id', 'password', 
    'forgot_password_question', 'login_with_otp', 
    'register_new_account', 'remember_me'
  )

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.01470144,
    "nested_loop": [
      {
        "table": {
          "table_name": "lang",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "392",
          "used_key_parts": ["lang_code", "name"],
          "loops": 1,
          "rows": 8,
          "cost": 0.01470144,
          "filtered": 100,
          "attached_condition": "lang.lang_code = 'de' and lang.`name` in ('returning_customer','enter_your_phone_no','enter_your_mail_id','password','forgot_password_question','login_with_otp','register_new_account','remember_me','returning_customer','enter_your_phone_no','enter_your_mail_id','password','forgot_password_question','login_with_otp','register_new_account','remember_me')"
        }
      }
    ]
  }
}