SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682854ae24f0cc1a0cdaa3d64b973b9ed928f7a60754c5b8e8cdfd8dcc4d1695' 
  AND token = 'LHdzuYqTc7J7jwXlWnEjvIZzQL3HAClsp02K2rSjL8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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