SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a68245ccc1485d2c8f94a90df26b6934c32a40c0207197e8712bc88335d4fa' 
  AND token = 'buMbS5CpQJM8p99XANHmqCR/vtVKVQHHtYOSmzidNZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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