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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22dc00b07be5ad1d1ab3769af537b18e9fad1a0f8bd5157fe04157a6a9ba6cbc' 
  AND token = 'EIYn0XLnmfZHA5koyP8s3wSYeA/DP/yMzAei/eFrMy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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