SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11b065d76ff0278623a24033876336c28a249a243db17e6eec05c77f1b98d79' 
  AND token = '9pSBsS9qhtFVlZAVhThbPVRFidjhsl/MTBRT7151LDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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