SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecfd8156a2cb1a593a6404ccfe27fe2457b474c4ea3e8d04315fc5581e86d5a' 
  AND token = 'v+U4n40KJKhmoStokWlAvxgVhBjvw++saveUwnjzgHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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