Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ca06405656aca65e5cfb27717e087bead6cf54d260a921149570997baf4d08' 
  AND token = 'Em1S1MPOn6SacElzacNavsXRDTbTxLL7eBqY5AMMBYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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