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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e71d238a5ae52f71832ff1a7ae08eb19dcc6b4b777871b167854e4edccfac61' 
  AND token = 'lnCTW/9E8QzgnOB/fyO4zW676/izVPyfLcetqlXRlME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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