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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbaa914dbe79341709ca8b01f3eaaab035cd426a949f168c0cbafe114fab76a' 
  AND token = '0c+aUiv0nll7UIhWR//N+pw9FAyCzC/wlWFhNSGQAZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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