SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52151f5c658c796ea85a9219586efd17b463eda0da6492c168fb295c64ac25a' 
  AND token = 'jUf6rqMQJykj7lCKnqZv1Zy/bkcwQZY9VLSxhNiDFXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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