SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3834b5a8c008b8c13ff7193061bd5f341948a51a077baf75603f5e7bc928616e' 
  AND token = 'DSBhvKlfFOgUT+6MYnjjw21HnOe08w6f+LIm1KK+UHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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