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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4805cea8db29b01d69145969bd035a8aa15e700badf3bb63c5fa2796103fd7c' 
  AND token = 'bRUBvUJMggBMFltrZ34gyQ4oWBs+L/WVF0xBBC7/M00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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