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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab6471b57efcc68b257aa8707bce96280d7d71919113f6de5e8659284f0b836' 
  AND token = 'q7/adcEf6hfi8Q1B311/XqF6ObFWo0n4+Nvl8PTxMX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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