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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4be45d42909f140cb41bc8c6610062ed4e11f406a7f2f6299b1f2fc554def6' 
  AND token = '7fYsKkDbnEdw1dacbyRIQ6kqY5uAwxSvDkDQki8inz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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