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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63e20f6a180de25e3b91004d73bee98127e4f6432d5ea3a55b7ee2f6ea29836' 
  AND token = 'YjIeZgtnSIokq4We4EajEbHwBgxsoJfKS2Tgqmi5vZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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