SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8790781047bca9995356212a01163c8f897cf41de353f6b19d082a791dbbe11c' 
  AND token = 'vLJmGkkp2RoP/iXb9whejm12vc/gBMT3BBvPfD9peLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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