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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a950ed0ed80ad17d80112cf1d4f61d68897c8b36dff2f853d2246e0783c585f' 
  AND token = 'sz07F8If8T7/E2/NsKOueNVW6hUJ3t4IZbGB/6A4lCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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