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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e80ae5375eb1f0e5e7fe18c65bb67a32f6ecaa46bccf324e1e1d1c5c4b03828' 
  AND token = 'DcHD7hKIqHJlPJdluppIUmXoEelbuwY4hzZjALQ+XrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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