SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6a82a7c58bf7f71f742ca0136e3a25139c1cb795f19009d35ae97b9d2387df' 
  AND token = '3hZ1qfnm9MhhlI+T+K8B4WXIuWPMYrXlYLATRP/eyhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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