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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ce079f93766888ed9fc1d2ec206eb330e000c7fee7b7038936fbf106fc87c8' 
  AND token = 'myUt2RyLYi3qniFBtts74Q8sv1D8b/9sCT7MU7w2zVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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