SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc8f15edf48693f94f0184c8584ff097a83a0bdb5c37a6b5c0aaf392e288693' 
  AND token = 'zYS9Ysq2IHKFtC0X1wZL/y7QGehDGBahUYwSw+wTJGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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