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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1d9ebd8d859929d8f478d6b46f13bab37b320f79056a56b8c2942cfb1cf52b' 
  AND token = 'W5ueylEhNO9nRFLzQaAMTqq9mIGmQexSPDq0SyVoMyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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