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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eda3e737f40c663def98b4b6eb6c85196a6a352a99f751c9510ae5c576eb100' 
  AND token = 'UFjv1MvLg9jO7OWEYAYwP3lglPXMasmNyiYZPiUcG4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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