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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc3dcc7e2a03d910c9c0b5e9f1bfca8b02cf2079f46f5de2d09c3ccc9830bb3' 
  AND token = 'XHRVCh8bMkojUM9g2puEbGY9ut6Z5qY/DVLegngqquM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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