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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1230f4a35676b0014eca48010c9c37a882347384d2b5cefe76b4060ee5c279a7' 
  AND token = '8ic1INuCWqO2t2m6jpkyMeep+xSzocpl7mimyWTkkCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}