SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99f7149aa5c3d6d7dff7972856ef665bbac8a43805dab22f272477e2f2d0e6c' 
  AND token = 'RMVQ/EuUg5Exx0/tCl99YaQDQOFeuqrgTTKLWRKwjGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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