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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822fd56a74af02e7efd6ba2101be1ac5aed236cba144fe0607399ba13260be59' 
  AND token = 'pVN48gEIsS1GSK2H6x69yVItPanBpeBKCVDn8vhNuyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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