Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31d01a960d180972083be98de1faac872bd2a5a4ee8e75c710b0e994c9c03ca' 
  AND token = '5bCKzcXIK520e881yHYD0RKQ0anoDxiw+uZYzt5u490=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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