SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3528024907a62adc5fc9b9f192f695db0141ea65f389da8695bc50dee97f3649' 
  AND token = 'wxmBKrRmBy1gqd2DZqyuee7ehOhuJg2P+xC1ICHr+Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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