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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e1918c8ca9ae44fe14923a1a736127a92c7442ca6a9146afc76f09e7398ba7' 
  AND token = 'hJGOV9iXmUMM5zHikW5aICSauVRqwVG+e4AWHO7um+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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