Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc147e10a9cfb84953af092479f4a568650c15eccc4f9513e458f52694f99d5e' 
  AND token = 'zsHssMKwGmYsIPcaE3//5d+ntShuHFVw0PGV2v57YFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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