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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d6149d1e006964d8e8b9b39eb04d9fa00ff7a039cdb47c41d4f6141c408875' 
  AND token = 'jSB6cogk9UnFOiBFgWhLuG9wBmn9dsfuZP/0OsNNVZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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