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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d00c88986ebb6677d504912ae7d6e76466c079a5bd058253283cf45b9fd87c' 
  AND token = '4nozM8ym0LSovMmE3UM+pS+h4if2nF2xJpb4ykx0778=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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