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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cace3e110e519c918b97ff3d949758e56d3c93e2abb721ad3e3abc0a079183' 
  AND token = 'YybYp+DWkP+fphGK7vkRk1jAWuzlQgxnbW+DoJD9uRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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