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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79729e8bc281cb06b23be36ddce8345e48b54170ec31acfb1bc7151fe31dbea4' 
  AND token = 'xnWGYv7Aqn5AiJ7mOrHOHTDnoT9k4CK9GOge+XR9oGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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