SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6b07aa178eb312c3c39079e51d2cfde6ef232af35dd648bc9ac4e49206fba8' 
  AND token = 'PPvoI/FcPhpSZVNsi6nsg+NNYhxzsCzYqAkRo4YGZEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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