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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6d284ee160dceb08ecf54618b701b59871169e936630b6d6161ec826b94e46' 
  AND token = 'MnHid0DKmQ7AULQicDBmFU/6Yh5ox0lYjko1QiQcY3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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