Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec347948cc9205aa223dcf22e55d0e74d6383bfcdb073295183553d578230052' 
  AND token = '7iCEH92F1CmiDTmx8mxG1K8XXlwtbRNDR9e819hEW3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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