SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0de8de24a1e746fcc0e35c60586c47031bb5f4d9c9b3245ca6da3f742d0c83' 
  AND token = 'VB4OA/ZO/72GVYOCTomjRzUEA3XMIbErZ+rZXy5hH5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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