Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758fc38259fe04f2c4095ba751935b3b34fd525f332b84c622ecf94561ae8694' 
  AND token = '8+ubuyP6ag3i6hCW7XJdutHngAB4ve52rBB3ADTiRFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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