SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055ba254bdf24196506daa21c7608d3d446d0c35a588c0a86234d0b70f48627d' 
  AND token = 'PqUmHHtuj2v5LsiPF/ZlQJgjKogxjg/iEAK2AJw/o6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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