SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80584f8423e58370e71c44c38b1869942175b07d3fc68cf9bc68bfe63ed469c3' 
  AND token = 'hjp0KnLvb0VD7oEBcHK3SAnadIJlRCzNfKqHwpVVUA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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