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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d9311b71378925788c68253d4581794537c600863e634263e02e23b172aefa' 
  AND token = 'HidEuoE9Ibq7MNNYOGODj/9p6K1KL/eAhWmk2pBIJe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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