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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab702bf797298ce98fe095366a24d351a1664474208eb060ee6fc9570190a35' 
  AND token = '6WAgOLHFfEd+GvGwOz9V+Vr6XGlfu+5nESC3E243OfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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