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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdda90e17408323f326734771e73d8f3368ddcf32efc3121dd1530aba1e7212c' 
  AND token = '5+yuduWX/taM+mIC7CmKz0BomA0MaXK2XKa8xfzf5UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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