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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe054fdbc4f967a152653cb2b9b9bd6a94a15c1182656bfa59406e56b3973c1' 
  AND token = 'XGTrhPQXbTG44T6mRqazg4eyCHDWK8DVHbFrRXBKdXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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