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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd814acbe12fc94ffae5d88d9b996c83770df35b7adf3ae505a6434f99c5dd7f3' 
  AND token = 'm7LErr1pharQHjJfdy4FZ7T8xVcjCqnZ1F+7yYhHMns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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