SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee557b124949202b8b0c89dad210b6b3dd92f3a597128b85a04bcdf583ab1578' 
  AND token = '+vBjIQmKED4b3VbSHnLhKUgzF0aK04G9yY2mVyRHF+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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