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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a79911aca4b24a3d2f8c996f65b217d7e8d22de0382cb441eb385c0ed49e47f' 
  AND token = '599FIsXM3IkEw1Aw5J1bkgCj7XZhMiYhJHXpZfZBjvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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