SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0d25c6d860f4a99a78b1b57a7c0533a7de5cd0279bbe6eb3dcd7f1380023d1' 
  AND token = 'Bh8mUOOeYO8WT2FBsvjsZtHizDSWrGd/ioPf1GwvW/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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