SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a30a60fad8c27330875a720e94cc245a519927558aa49d6c79178b326189dcf' 
  AND token = '3jL/JRLgTqaI/yratVd0+MJZBK+hgGl2FLwbVD4w4Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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