SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ffc7801f77d49c0deb8a275634b4adf375bac9798c81a3c9b15e88e86571177' 
  AND token = '9VVDblgbyGeYgz2m5IuCWmxhcGHw+EX+o4Zbvu6b2jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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