SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0f6fbdcdf1c5997510132292d797c9d4d7e330180c4deb01c5573b7db57865' 
  AND token = 'ZLYhvQ+9YhP14/uNexVVIcGQfGZLxQpT/RKtlzA8ihI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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