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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8811ba6bea5e5d7fe634527048d1d3d809862dc016facaede390246922f7baae' 
  AND token = 'lpS8rvFLzU5P+IFQpwVtHqw+HudTIeklKzA0XwqDaTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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