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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405cec67524bfce287ae7eeb167b1a3a6638cb407b181ef6e4775e9f6f67ec32' 
  AND token = 'OmwmZV7ZMiTzy1P2lBOQY3iTOw92/loB1ebW+L9sHSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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