SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903e608773d7f02e5736c15d8606dd59b6fbc92ae5891e3cb0085bd423ea9386' 
  AND token = 'zbqtvjYFpi0Aq2//keZxU5EniMGR+JwKNwL0NPsIwhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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