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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe490f6d57c7ebf8a1f25903a6a4bce1c7814215658e8caff71639ce93024958' 
  AND token = 'uF0sMybJ/YpiSn5fv7KdLXEXC37lu0da7PClioklA9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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