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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824ef6ec9b9cd9020e2fd7636323f7350534be1d7827a8a984da534260a5ffd8' 
  AND token = 'E3gNcLMbVQKN14yBs0leO72jmujWzvsW/WWjfK2tOnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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