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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d89b3b95fc12f13b00e726f2d2ceecdf14a17f36bc02a59fc558f241e42432' 
  AND token = '0SltMxaE9jGqTfhgtPHuHa7u4oXQpe2/4NCkQKH1fMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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