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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8d7ad7d4d80382f94b2d95a95aecef2d832885e8619a56c01d31be7f063ac2' 
  AND token = 'YLoTf8miAHyUL/S6ryLxbuUDqh1M/MH7wLNJoOljGFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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