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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314152b9afd40b393a709a8effaf25a84dd27d231a05f17de0cc4f36ef201ff6' 
  AND token = 'Rozi2/PFdzj+ZyT5fmNID8lasWqHxqeXY0BJ2aJDxSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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