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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2fc90ee68f55ee71a0ab3ebd350b8a6b035d91cf4fe1eb8751ed2c1625280d' 
  AND token = 'QW/+qoQl2E2OoxxU1Xns7IWdYqV9mvmi7vVGV7mz8QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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