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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eddc1f2d8cec591420f57bda9b71309692cc865fda961ce522ffb15246a3d9f8' 
  AND token = 'bKz7S7tsAAXu0T0HvWqhQWvUCA1yohDEQLzsnn/hZkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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