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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44c5339037b91882f33ef272e2164ff434aacee4877d0aeaf627e070cb1e688' 
  AND token = 'WbTz2qxde+PxWl6VKlW6zvr7sxpQTZB9GSHnD83CuOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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