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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b671b507723e497091d0eb0da24ace58e1d13424011e4b11ad06c65b7587cb3' 
  AND token = 'DsxGFeBvDdIxmbvIE8WPSI42QNiKA0a2818IVxdLC4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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