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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6558f73e1994d890898a3cb9f7af285e3b0f1863f6c3f6fc34bc3b2e73317f' 
  AND token = 'TySu6ShsWaYqNSG2aYp4MBqQWFTEnb2c1HMP6SlQGUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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