SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab9c39d2a07049803e386f45739b6553192a772460b9ae535fc89901bfe3915' 
  AND token = 'sToZQ/Z6ApIM5PTqL3YSqxXQF7hPVV7mJPUUXp9pGFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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