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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d73f27f32013c403cc2a8d2b9e4be07c332b05f320fe91daf97a3e5b57b131' 
  AND token = 'wRg0EwJShJX8Y/9Vn1qRH0Rm0ngnfYDkGoysdxfnzk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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