SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883100793d28a216bd3e3ee4da3a5653f96857da560f36400c48fcf3ffc73f00' 
  AND token = 'kRFxKXfYvZZHGIz5dmXqCvzx2YAeWAuF+VTmqnROr90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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