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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff7404bc307f2ab67142e32c8f842eabf6cbfebfe2495692544563fb4edd07d' 
  AND token = 'M8y1Y73FMORCYetWqwUziBIhFQa1eHJ3KapbsYKWc4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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