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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d42dc9620db4b21ab9221155d748c6f843028aab33122101631890f500abed5' 
  AND token = 'tumXRvKAZblWuRY1fBm8/WnKac8DFLmzjc66t8K+wHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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