SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd456a253881c9c3c7625133455f081c043a965cdfd1db13f6701b86e294a021' 
  AND token = 'P7vXfqV2dwKqrjAO6Rpg7NKqvhS7bEEP2lFvPwOAqAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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