SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7623c777556bcfab6e0e7e5933cc7851bb426ce467b13c48700b2b906f6697' 
  AND token = '853uV1r4MoD+C9IY+yrxq3jZv/KrbWZIwYZOhbBdNGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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