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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f91a30c9411feac54803eb09b1860c8457640f6f9318be27e65e149e979e960' 
  AND token = 'sFKA+s4a4PcHRj9fpbOAP8pkRAYlb9NVboWnp56IWNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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