Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871e80ec498dc0776c1ccb20a2a2fed65db7febb91d609e7363d22ff6c74b4b2' 
  AND token = 'k/Vf3PAEHLohYJDqLwQk4P1WrCNmomUTyFNp2jacCsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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