SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f0ad96d723b2f69b440c86f1236ac02ff949f78d1c7eb885e47e7e4a730a4e' 
  AND token = 'ZwIKxGv/vJjjOYs0RnqulavM/G97yE6Lp3a4Z/r+he0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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